Robert Downey Jr.'s baby boy news -- is he in trouble with the wife?

On Tuesday's (Dec. 6) "Tonight Show with Jay Leno" "Sherlock Holmes: A Game of Shadows" star Robert Downey Jr. revealed that he and wife Susan Downey are expecting a baby boy.

But, reports E! Online, Downey may be in trouble with the Mrs. for spilling the beans without checking with her first.

"I can never really stay mad at him, but I can tell you it wasn't something that we had planned to reveal," Susan said at the 'Game of Shadows' premiere. "I was over at Warner Brothers [studio] which is around the corner from Leno and he came through and he immediately admitted it. I was like, 'Really?!'"

"If I told you the name, she would lop off my head with a machete," added Downey.

Downey already has one son, 18-year-old Indio, from a previous relationship.